354 



MULTIPLICATION, 



the space consequent on the obhquity of the base of 

 the leaf. In the other it would seem as if two distinct 

 leaves emerged from the stem in juxtaposition. This 



Fio. iy4. Supernumerary leaf, Ulmtia montana. 



is probably due to a lateral chorisis or subdivision of 

 the primitive tubercle or growing point, followed by a 

 like subdivision of the vascular bundle supplying it. 

 There are certain varieties of elm that very generally 

 present this anomaly on their rank, coarse, growing 

 shoots. In these cases the new growths have the 

 same direction as the primary one, but in other cases 

 the supplementary production is exactly reversed in 

 direction. Thus, in the common hazel (Coo-ylus) a 

 second smaller leaf proceeding from the end of the 

 leaf-stalk at the base of the primary one may frequently 

 be seen. M. Germain de Saint Pierre records an 

 instance in a mulberry leaf, from the base of which 

 proceeded a large leafy expansion divided into two 



